|
|
 |
|
 |
|
- Level 1 Waveform Data Records
- Orbital format waveform
data records at the full data rate which contain the time, location
altimeter return waveform, and retracking parameters.
- Level 2 Ice Data Records
- Orbital format ice
data records at the full data rate which contain the time, precise location,
altimeter height measurement, corrected precise surface elevation,
atmospheric corrections, tidal values, retracking corrections, and AGC.
This data is updated on-line as more precise orbits, corrections, and
tide values become available.
- Level 3 Geo-referenced Database
- Contain surface
height measurements derived from altimetry data, ordered by geographic
areas or "bins". Each data record contains the geodetic position,
revolution number, surface elevation relative to a reference ellipsoid,
and slope correction.
- Level 4 Elevation Grids
- Gridded elevations are calculated from the data by a weighted fitting
of a bi-quadratic function (bi-linear where data distribution is poor) on
a polar stereographic projection with a nominal spacing of 5 km (ERS-1)
10 km (GEOSAT) and 20 km (Seasat).
- Crossover Data
- Gives interpolated elevations for different tracks at the same location
including the corrections also interpolated to the crossover location.
|
|
|
